Method for routing in a central conferencing routing server

ABSTRACT

Aspects of the present disclosure involve systems, methods, computer program products, and the like, for collaboration conferencing with multiple participants over a communications network, and more specifically for a conferencing routing service for managing and routing collaboration participants. A collaboration conferencing routing server may provide configurability in routing a collaboration conference to a conference bridge based on any number of criteria and information about the requester and the communications network on which the conference occurs.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of and claims the benefit of priorityto U.S. Non-Provisional application Ser. No. 13/708,659 titled “METHODFOR ROUTING IN A CENTRAL CONFERENCING ROUTING SERVER,” filed on Dec. 7,2012, and is hereby incorporated by reference herein. Application Ser.No. 13/708,659 claims priority under 35 U.S.C. §119(e) to provisionalpatent application No. 61/584,115 titled “CENTRAL CONFERENCING ROUTINGSERVICE” and provisional patent application No. 61/584,122 titled“CENTRAL CONFERENCING ROUTING SERVICE,” both filed on Jan. 6, 2012 andboth of which are hereby incorporated by reference herein. ApplicationSer. No. 13/708,659 claims priority under 35 U.S.C. §119(e) to U.S.Provisional Application No. 61/578,794 entitled “SIP-BASED VOIPCOLLABORATION”, U.S. Provisional Application No. 61/578,798 entitled“SIP-BASED VOIP COLLABORATION”, U.S. Provisional Application No.61/578,803 entitled “SIP-BASED VOIP COLLABORATION”, U.S. ProvisionalApplication No. 61/578,807 entitled “SIP-BASED VOIP COLLABORATION” andU.S. Provisional Application No. 61/578,810 entitled “SIP-BASED VOIPCOLLABORATION” all filed on Dec. 21, 2011 and each of which isincorporated by reference in their entirety herein. In addition, thisapplication is related to co-owned U.S. Non-Provisional patentapplication Ser. No. 13/708,636 titled “CENTRAL CONFERENCING ROUTINGSERVER,” co-owned U.S. Non-Provisional patent application Ser. No.13/708,678 titled “LOAD BALANCING IN A CENTRAL CONFERENCING ROUTINGSERVER,” and co-owned U.S. Non-Provisional patent application Ser. No.13/708,689 titled “DISASTER RECOVERY WITH A CENTRAL CONFERENCING ROUTINGSERVER,” each of which is hereby incorporated by reference herein.

TECHNICAL FIELD

Aspects of the present disclosure generally relate to systems andmethods that provide for collaboration conferencing with multipleparticipants using devices connected to a telecommunication network,including a VoIP network, and more specifically for a conferencingrouting service for managing and routing collaboration participants.

BACKGROUND

Telecommunication networks provide for the transmission of informationacross some distance through terrestrial, wireless or satellitecommunication networks. Such communications may involve voice, data ormultimedia information, among others. In addition, telecommunicationnetworks often offer features and/or services to the customers of thenetwork that provide flexible and varied ways in which thecommunications are transmitted over the network. For example, sometelecommunication networks provide a conferencing feature that allowsseveral users of the network to communicate at once, rather than asimple person-to-person communication. The number of participants to aconference communication may range from several users to severalthousand users communicating on the same telephonic, video and/or datacall.

Typically, conferencing communications require participants to theconference to place a telephonic call to a dedicated conferencingnumber. Some networks also require the participants enter a conferencecall code into the keypad of a telephonic device. The conferencingnumber and code are then utilized by the telecommunications network toconnect that participant to a conference bridge device. In general, aconference bridge is a telecommunications device that hosts theparticipants of a conferencing communication such that the participantscan participate in a conference call. Thus, the network typicallyreceives the dialed number and conference code from each participant andconnects the participant to the conference bridge. Once connected to theconference bridge, the participant may take part in the conference. Toensure that each of the participants of the conference may take part inthe communication, each participant must connect to the same conferencebridge. However, the routing of the participant to the conference bridgetypically occurs without consideration of the routing of the otherparticipants to the conference bridge by the network. Rather, eachrequest from each participant may be routed to a conference bridge on anindividual basis.

It is with these and other issues in mind, among others, that variousaspects of the present disclosure were conceived and developed.

SUMMARY

One implementation of the present disclosure may take the form of atelecommunications network. The network comprises a plurality ofcollaboration conferencing routing servers comprising a masterconferencing routing server executing a master control engineapplication and at least one slave conferencing routing server, whereineach of the plurality of collaboration conferencing routing serverscomprises a database configured to store a state of at least oneinitiated collaboration conferences on the telecommunications networkand a plurality of conference bridges configured to host a collaborationconference connected to the plurality of collaboration conferencingrouting servers. In addition, the master control engine is configured toperform certain operations. Such operations include receiving acollaboration conference access request from a requester to initiate acollaboration conference, associating an identification number with thecollaboration conference access request, the identification numberassociated with a customer of a telecommunications network selecting ahosting conference bridge from the plurality of conference bridges, theselection occurring in response to the collaboration conference accessrequest and identification number and transmitting one or moreconference state messages to the at least one slave conferencing routingserver, wherein the one or more conference state messages include anactive state of the at least one initiated collaboration conference andan indication of the selected conference bridge.

Another implementation of the present disclosure may take the form ofmethod for routing one or more collaboration conference access requests.The method may include the operations of receiving a collaborationconference access request from a requester's telephonic device at amaster conferencing routing server of a plurality of conferencingrouting servers, wherein the a master conferencing routing serverexecutes a master control engine application and associating anidentification number with the collaboration conference access request,the identification number associated with a customer of atelecommunications network. In addition, the method may includeselecting a hosting conference bridge from a plurality of conferencebridges connected to the plurality of conferencing routing servers, thehosting conference bridge configured to host a collaboration conference,the selection occurring in response to the collaboration conferenceaccess request and identification number and transmitting one or morerouting messages to the telecommunications network, wherein the one ormore routing messages include an indication of the selected conferencebridge.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematic diagram illustrating an exemplary Voice over InternetProtocol (VoIP) operating environment, including a central conferencingrouting server, in accordance with one embodiment.

FIG. 2 is a block diagram illustrating a conference bridge configured tohost one or more conferencing communications.

FIG. 3 is a flowchart of a method for the CCRS of the network 102 toreceive a request from one or more participants to join a collaborationsession and route the participants to the proper conference bridge

FIG. 3B is a flowchart illustrating a method for a central conferencingrouting server to receive a request for a collaboration conference andassociating a master identification number to the collaborationconference.

FIG. 4 is a block diagram illustrating several components of a centralconferencing routing server.

FIG. 5 is a diagram illustrating an example of a computing system whichmay be used in implementing embodiments of the present disclosure.

FIG. 6 is a block diagram of a plurality of central conferencing routingservers connected to a plurality of conference bridges over atelecommunications network.

FIG. 7 is a flowchart of a method for a control engine of a centralconferencing server to gather connection information for thetelecommunications network.

FIG. 8 is a flowchart of a method for a plurality of control engines ofconferencing servers to establish a master control engine.

FIG. 9A is a block diagram of the network of FIG. 6 illustrating afaulty connection between two central conferencing routing servers.

FIG. 9B is a block diagram of the network of FIG. 6 illustrating afaulty connection between a central conferencing routing server and aconference bridge.

FIG. 10 is a flowchart of a method for a establishing a conferencingcollaboration on a conference bridge.

DETAILED DESCRIPTION

Aspects of the present disclosure involve systems, methods, computerprogram products, and the like, for collaboration conferencing withmultiple participants over a communications network, and morespecifically for a conferencing routing server for managing and routingcollaboration participants. In one example, a central conferencingrouting server (CCRS) may be implemented in the communications networkto receive a request to join a collaboration conference from one or moreof the participants and route the participants to a shared communicationbridge that conducts the conference. Additionally, the CCRS may receiveand maintain information about the communications network tointelligently route the collaboration conference to an appropriatebridge based on any number of criteria. For example, the CCRS maycommunicate with one or more conference bridges associated with thecommunications network and determine which conference bridge will host acollaboration conference request from a collaboration participant.

The CCRS may also determine which conference bridge will host acollaboration conference request based on other information. Forexample, the CCRS may maintain a database of information or preferencesassociated with the conference requester and attempt to select aconference bridge based on the requester's information. Such informationmay include, but are not limited to, a regional preference, the size ofthe collaboration request and certain collaboration features of theconference collaboration. In another example, the CCRS may receiveperformance information from a plurality of conference bridges able toconduct the collaboration conference and select a conference bridge inresponse to the performance information. Additionally, the CCRS may beconfigured to respond to a failure in one of the conference bridges toallow for repair to the network and/or account for split conferencesthat may occur due to the bridge failure. In general, the CCRS mayprovide configurability in routing a collaboration conference to aconference bridge based on any number of criteria and information aboutthe requester and the communications network on which the conferenceoccurs.

FIG. 1 illustrates an exemplary operating environment 100 for hostingconference collaboration communications between multiple participants.The environment 100 provides for setting up communication sessionsbetween network users. With specific reference to FIG. 1, theenvironment 100 includes a VoIP network 102, which may be provided by awholesale network service provider. However, while the environment 100of FIG. 1 shows a configuration using the VoIP network 102, it should beappreciated that any communication network is envisioned as included inthe operating environment 100. For example, network 102 may be a circuitswitch communication network utilizing time division multiplexing (TDM)or plain old telephone service (POTS) switching. In general, the network102 of FIG. 1 may be any communication network known or hereafterdeveloped. However, for ease of understanding, a VoIP network embodimentis hereafter used to describe the communications network.

The VoIP network 102 includes numerous components such as, but notlimited to gateways, routers, and registrars, which enable communicationacross the VoIP network 102, but are not shown or described in detailhere because those skilled in the art will readily understand thesecomponents. More relevant to this description is the interaction andcommunication between the VoIP network 102 and other entities, such asthe one or more customer home or business local area networks (LANs)106, where a participant in a conference will connect with the systemfor the conference.

Customer network 106 can include communication devices such as, but notlimited to, a personal computer or a telephone 110 connected to arouter/firewall 114. Although shown in FIG. 1 as telephonic devices 110,the communication devices may include any type of communication devicethat receives a multimedia signal, such as an audio, video or web-basedsignal, and presents that signal for use by a user of the communicationdevice. The communication and networking components of the customernetwork 106 enable a user at the customer network 106 to communicate viathe VoIP network 102 to other communication devices, such as anothercustomer network and/or an analog telephone 115, 120. Components of thecustomer network 106 are typically home- or business-based, but they canbe relocated and may be designed for easy portability. For example, thecommunication device 110 may be wireless (e.g., cellular) telephone orportable laptop computer.

The customer network 106 typically connects to the VoIP network 102 viaa border network 122, such as one provided by an Internet ServiceProvider (ISP). The border network 122 is typically provided andmaintained by a business or organization such as a local telephonecompany or cable company. The border network 122 may providenetwork/communication-related services to their customers. In contrast,the communication device 120 accesses, and is accessed by, the VoIPnetwork 102 via a public switched telephone network (PSTN) 126 operatedby a local exchange carrier (LEC). Communication via any of the networkscan be wired, wireless, or any combination thereof. Additionally, theborder network 122 and PSTN 126 may communicate, in some embodiments,with the VoIP Network 102 through a media gateway device (130, 132). Forease of instruction, only three communication devices 110, 115, 120 areshown communicating with the VoIP network 102; however, numerous suchdevices, and other devices, may be connected with the network, which isequipped to handle enormous numbers of simultaneous calls and othercommunications.

In general, a request for a collaboration conference over the VoIPnetwork 102 is initiated by a requester through one of the communicationdevices 110, 115, 120 associated with the network. As used herein, theterm “collaboration conference” includes any type of collaborationbetween three or more users of a communication network. For example, thecollaboration conference may include audio collaboration, videocollaboration, web collaboration, a combination of any of the above, andthe like. For ease of instruction, the collaboration conferencesdiscussed herein are generally made in reference to an audio conference,although any type of collaboration conference over a telecommunicationsnetwork is envisioned with respect to the present disclosure. Similarly,although FIG. 1 illustrates the communication devices 110, 115, 120 astelephonic devices, the communication devices may be any type ofcommunication device, including personal computers, cellular phones andthe like.

Upon receipt of the request for a collaboration conference, the network102 routes the request to the CCRS 140, integrated within the network102. However, it should be appreciated that the CCRS 140 may be a partof the network 102, may be separate from the network, or may haveportions deployed in the network and out of the network. In addition,the CCRS 140 may be resident on one or more components of the VoIPnetwork 140, including several instances of the CCRS 140 integratedthroughout the network 140. Further, although only a single instance ofa CCRS 140 is illustrated in FIG. 1, any number of CCRS instances may bepresent in the network 102 to form a CCRS system. As discussed in moredetail below, the network 102 may account for the availability ofmultiple CCRS devices or instances through a process of establishing amaster CCRS control engine.

To transmit the request to the network, the requester uses thecommunication device 110, 115, 120 to dial a conference specifictelephone number. In some instances, the network, upon receipt of thedialed communication, executes an application that queries the requesterto enter an access code number that the requester enters into thecommunication device 110, 115, 120. With this information, the network102 determines that the requester intends to initiate or join acollaboration conference and routes the request to a conference bridge,as explained in greater detail below.

In any event, the CCRS 140 receives the request to begin a collaborationconference or join an existing conference. In response, and described inmore detail below, the CCRS 140 may route the one or more requests toone of several conference bridges 142, 144 associated with the VoIPnetwork 102 for hosting of the collaboration conference. Although onlytwo conference bridges 142, 144 are shown in FIG. 1, it should beappreciated that any number of conference bridges may be associated withthe network 102 for hosting collaboration conferences.

In general, the conference bridges 142, 144 provide a hosting site for acollaboration conference between a plurality of users of the network102. Thus, conference bridge A 142 may host a collaboration conferencewhile conference bridge B 144 may host an additional collaborationconference. In particular, conference bridge A 142 is connected to thecommunications network 102 through a media gateway 133 similar to themedia gateway disclosed above. This configuration may be utilized whenthe conference bridge 142 is a time division multiplex (TDM) bridge.Conference bridge B 144 is internal to the communications network 102through which the communications of the conference are transmitted. Thisconfiguration is utilized for Internet Protocol (IP) based bridges.

Additionally, the CCRS 140 may be configured for use with any number ofnetwork and conference bridge platforms. For example, thetelecommunications network 102 of FIG. 1 may be configured as a TDMnetwork or an IP-based network, which includes video, audio andweb-based components, to which the CCRS 140 may be configured tointerface. Another particular network and/or conference bridge platformsupported by the network configuration 102 of FIG. 1 is a SessionInitiation Protocol (SIP) based network. For example, conference bridgeB 144 may be a SIP-based conference bridge. Such IP-based components mayprovide additional conferencing features to the network by providinginformation concerning the collaboration conference in a header of amessage transmitted through the network such as an identification of thecollaboration conference, video integration, Uniform Resource Identifier(URI) based routing and conference integration, conference accesscredentials for authentication and permission to enter the requestedconference. SIP-based conference bridges may also provide highdefinition audio, additional security features and transitions betweencollaboration conferences without having to redial into the system. Ingeneral, because components operating utilizing SIP can exchangeinformation within a header, many additional features for acollaboration conference can be offered to participants on a SIP-basedconference bridge. In addition, SIP-based CCRS devices may utilize manyof the advantages of information exchange within the header whencommunicating with TDM-based network devices.

To connect to a collaboration conference, each participant to theconference may be routed to the same conference bridge 142, 144 for theduration of the conference. The conference bridge 142, 144, in turn,provides communication ports for each participant such that eachparticipant can hear or otherwise participate in the collaborationconference. Any conference bridge known in the art or hereafterdeveloped may be integrated into the system 100 of FIG. 1 for hosting acollaboration conference. In addition, the term “conference bridge” or“bridge” includes any component of a communication network that providesan access point to one or more users of the network for a collaborationconference. For example, “conference bridge” may also include suchdevices as a media server device, a gateway server device or the like asconfigured within the network 102.

FIG. 2 is a block diagram illustrating an exemplary conference bridgedevice that may be utilized in the network configuration 100 of FIG. 1.The conference bridge 202 comprises an application server 208 and adigital signal processing (DSP) component 206. In general, theapplication server 208 of the conference bridge 204 communicates withone or more applications of the network to establish the collaborationconference. In addition, for SIP-based or other IP-based conferencebridges, the bridge may include a network interface unit 210. Ingeneral, the application server 208 includes one or more applicationsthat can be executed by the conference bridge 202 to perform many of thefunctions described herein for the conference bridge. In addition, theconference bridge 202 may include a network interface unit 210 forreceiving information and/or instructions from the network 202 to routeand connect a collaboration conference communication for that particularbridge. The network interface unit 210 connects to the media gateway 133of FIG. 1 or connects directly to the core of the network 100 to receivethe communications of the participants and connects each participant toeach other to establish the collaboration conference. The networkinterface unit 210 may also initiate one or more of the applicationsstored in the application server for execution by the conference bridge.In general, the conference bridge 202 may receive a request from thenetwork to connect a requester with a hosted conference. The request maybe received through a signaling protocol, such as through a SIP-basedcommunication. In response, the application server 208 may provision oneor more ports for connection to the requester's communication. The appserver 208 may then signal to the network 102 that the ports areavailable, at which point the data or audio portion of the communicationmay be routed to an available port in the conference bridge 202. In thismanner, the handshaking between the network and the conference bridge202 may occur over the signaling plane of the IP-based protocol separatefrom the data or audio portion of the communication request. A moredetailed description of the method through which a request is routed toa conference bridge 202 is included below with reference to FIG. 3.

Returning to FIG. 1, the network 100 may be utilized by one or moreparticipants to a collaboration or conferencing communication hosted ona conference bridge 142, 144. In particular, FIG. 3 is a flowchart of amethod for the CCRS of the network 102 to receive a request from one ormore participants to join a collaboration session and route theparticipants to the proper conference bridge 142, 144 through which thecollaboration is hosted. In general, the operations described inrelation to the flowchart of FIG. 3 are performed by one or morecomponents of the CCRS 140 as part of the telecommunications network102.

Beginning with operation 302, a participant to a conferencecommunication may dial into the conference using a telephonic device110, 115 and/or 120. In particular, the participant may dial aconference number and/or enter a conference code to access thecollaboration conference. The media gateway 130, 132 or other switchingdevice routes the request from the participant to the CCRS 140 throughthe network 102. In FIG. 1, the request is illustrated by the dashedline between the media gateway 130, 132 and the CCRS 140. As should beappreciated, in some IP networks, the request may be routed to the CCRS140 on a signaling plane and does not include the audio portion of thecommunication. The request is then received by the CCRS 140, asindicated by operation 302 of FIG. 3.

Upon receipt, the CCRS 140 determines, in operation 304, which of theavailable conference bridges 142, 144 associated with the network 102that is hosting or will host the collaboration conference requested bythe participant. The CCRS 140 may utilize several factors to determinewhich conference bridge 142, 144 hosts the collaboration conference.Such factors and operations performed by the CCRS 140 to determine theappropriate conference bridge are discussed in more detail below. Inaddition, the CCRS 140 may communicate with one or more of theconference bridges 142, 144 associated with the network 102 in operation304. This communication between the CCRS 140 and the conference bridgesis illustrated by the dashed lines between the CCRS and the conferencebridges in FIG. 1. Further, in the embodiment in which the conferencebridge 142, 144 is within the network 100, the CCRS 140 wouldcommunicate directly with the conference bridge without going throughthe media gateway device 133.

In one embodiment, the CCRS 140 communicates particularly with the appserver component 208 of the conference bridge 202 to determine theappropriate collaboration bridge and to establish the collaborationconference. The app server component 208 of the conference bridge 202may provide any information concerning the conference bridge to the CCRS140, including number and types of available ports, the technicalcapabilities of the conference bridge, current collaboration conferencesbeing hosted by the conference bridge, and the like. In another example,the conference bridge 142 may be a SIP-based conference bridge. In thisexample, the CCRS 140 would communicate with the app server 208 throughthe network interface unit 210. The app server 208 then provisions therequested ports and notifies the CCRS 140 when such ports are availablefor the collaboration conference. In addition, the app server 208provides the information of the conference bridge 142 that may beutilized by the CCRS 140 to determine which conference bridge will hostthe collaboration conference.

For example, a participant may utilize the telephonic device 120 orother communication device to access the network 100 and request accessto a collaboration conference. The media gateway 130 associated with thecommunication device 120 routes the request to the CCRS 140. Inresponse, the CCRS 140 identifies conference bridge B 144 as theconference bridge which will host or is hosting the collaborationconference. In one embodiment, the CCRS 140 communicates with conferencebridge B 144 to determine availability and verify that the collaborationconference is hosted on conference bridge B.

In operation 306, the CCRS 140 requests an open communication port fromthe conference bridge 142 identified in operation 302. In the embodimentshown in FIG. 2, the conference bridge 202 may utilize a port in the DSPcomponent 206 of the conference bridge in response to the request sentby the CCRS 140. The open port in the DSP component 206 allows theparticipant to connect to the collaboration conference hosted by theconference bridge 202 and participate in the conference. In addition,the conference bridge 202 may transmit an acknowledgement to the CCRS140 from which the request originated to indicate that the requestedcommunication is open. Again, in IP-based networks, the request foravailable ports and acknowledgement may occur on a separatecommunication signal than the audio or video portion of thecollaboration communication. Further, a SIP-based network, the requestmay include certain information in the header of the request, such asthe master ID number and/or the number of requested ports. The requestmade by the CCRS 140 to the conference bridge is illustrated in FIG. 1as the dashed line from the CCRS to the media gateways associated witheach conference bridge.

In operation 308, the CCRS 140 receives the acknowledgement message fromthe conference bridge 142. In one embodiment, the acknowledgementmessage contains information that identifies the open port to the CCRS140. For example, in the SIP-based embodiment, the acknowledgment mayinclude the IP address of the conference bridge in the header of themessage. In response to receiving the acknowledgement message, the CCRS140 routes the participant's communication to the open port in theconferencing bridge 142 in operation 310. In one embodiment, the CCRS140 facilitates the communication to the conference bridge 142 such thatthe audio portion of the communication from the participant is no longerrouted through the CCRS. For example, in a network 102 that utilizesSession Initiation Protocol (SIP), the CCRS 140 may issue a “SIP Refer”command to the media gateway 133 in operation 310 to route theparticipant communication to the conference bridge 142, effectivelyremoving the CCRS from the communication flow. This refer message mayinclude the IP address of the selected conference bridge in the headersuch that the network can route the communication to the selectedconference bridge. The connection of the communication bypassing theCCRS is illustrated in FIG. 1 as the solid line connecting the mediagateway 133 associated with the participant's telephonic device 120 andthe media gateway associated with conference bridge A 142. Thus, throughthe use of the method outlined in FIG. 3, the CCRS 140 may receive arequest from a participant of a collaboration conference and route theparticipant to the proper conference bridge that hosts the specificcollaboration conference. In a similar manner, collaboration conferenceparticipants may be routed to media gateway 133 and conference bridge A142 such that multiple conferences may be occurring simultaneouslythrough the network 102 on multiple conferencing bridges 142, 144.

As can be understood in light of the CCRS described above, utilizing acentral conferencing server provides several advantages over previousconferencing systems. As mentioned, prior art conferencing systemsstatically connected each participant to a conferencing bridge based onthe number assigned to the participant. Thus, such networks had nomechanism for adjusting the load on any one conferencing bridge based onthe number of conference participants. In addition, such systems proveddifficult in determining proper billing rates for the collaborationconference as each participant could be requesting access to theconference from any place on the globe, without any central mechanismfor determining the location of each participant.

In contrast, the CCRS of the present disclosure provides flexibility inthe routing and handling of the collaboration conferences. For example,because each participant request is directed to the CCRS, handling ofthe participant request is easier on the communications network as thetermination point for each request is the same component of the network.In particular, by including a component of the network that is dedicatedto handling all requests for a conference participation, othercomponents in the network that were previously tasked with receiving androuting the request may be freed to handle other type of networktraffic. In addition, the CCRS provides protection against unintendedoverloading of a conference bridge. For example, a very large companywith several thousand employees may utilize the communication networkfor collaboration conferences. However, because collaboration conferencenumbers are typically directly associated to a dedicated conferencebridge for that number, too many employees of a particular companyattempting to initiate a collaboration conference at the same time mayoverload a conference bridge that is already hosting several othercollaboration conferences. To prevent this, many communication networksmay assign several conferencing access numbers to the very large companyso that the employees are spread over several conference bridges.However, providing several conferencing access numbers to a singleentity may be confusing to the employees of the very large company. Incontrast, because the CCRS provides dynamic routing of the conferenceparticipants, a single conference access number may be provided to thevery large company as the same conference access number may be routed toany one of the available conferencing bridges, rather than the dedicatedconference bridge for the number. In this example, even if an inordinatenumber of employees attempt to initiate collaboration conferences at thesame time, the CCRS can route the participants accordingly such that allof the collaboration conferences do not end up on the same conferencebridge that may overload the bridge.

In another example, an administrator of a collaboration conference mayprefer to include other types of multimedia communications to accompanythe voice portion of the collaboration conference. For example, a webpage may be provided to an administrator of the conference to providepresentations and/or control over the conference. The web moderator webpage provides such control features as the ability to mute allparticipants, disconnect a particular individual participant, show thenumber and identification of each participant, and the like. However,such a web page may not be within the capabilities of each conferencebridge. Thus, when such features are requested by a moderator of thecollaboration conference, it is often advantageous to place theconference on a conference bridge that supports such features. Suchrouting of a conference to a conference bridge that supports thetechnical requirements of the collaboration conference can occurdynamically through the use of the CCRS described above. Furtherexamples of dynamic routing advantages gained through the use of a CCRSin the telecommunications network are described below.

Also, a conferencing system that utilizes a CCRS can adapt to varyingaspects of the collaboration conference. For example, the CCRS mayidentify that the participants to a particular collaboration conferenceare originating from a certain region of the world, based on thetelephonic device the requester accesses the network. In this example,the CCRS can route each participant to a conference bridge that isgeographically located near the region of the world of each participantto improve the reliability of the conference. Also, the CCRS may aid inthe accurate billing of the conference to a customer by providing acentral location in which information for each participant to aconference can be retained and retrieved by the telecommunicationsnetwork. Such information may not be available to a conference bridgethat just receives communications from the telecommunications network asthe information may be spread over any number of devices in the network.

An additional advantage provided by the CCRS is a more robust and fasterdisaster recovery during failure of a conference bridge hosting acollaboration conference. In previous conferencing systems, suchdisaster recovery required a network administrator to reroute eachparticipant to the conference to a new conference bridge, requiring bothtime and manpower to accomplish. In contrast, the CCRS as describedherein may be programmed to identify a failure at a conference bridgeand dynamically reroute each participant to a new conference bridge.This rerouting of the participants to a new conference bridge may occurwith or without action by a network administrator such that disasterrecovery occurs automatically. These advantages and more may be realizedthrough the utilization of a CCRS in a conferencing system provided by atelecommunications network.

FIG. 4 is a block diagram illustrating several components of a centralconferencing routing server 140 that may be implemented on the network100 of FIG. 1. The components outlined may be implemented by one or moreprocessors executing one or more computer instructions stored in acomputer-readable medium. Examples of systems that may execute orimplement the components are provided below with reference to FIG. 5.Also, as mentioned above, the components of the CCRS may be located onany number of computing devices within the network, on any number ofcomputing devices outside of the network, and/or a combination of both.

The CCRS 402 may include a database 404 configured to store informationconcerning an associated network, one or more customers or users of thenetwork 416, identification numbers 414, and/or any other informationuseful by the CCRS in routing, billing, load balancing, disaster recoverand the like for collaboration conferencing communications. For example,the database 404 may store identification numbers 414 for individuals orgroups of users to the network who have access to a collaborationconference feature. Associated with the identification numbers may beone or more telephone numbers, access codes, communication deviceidentifications, master identifications and routing rules associatedwith the users. The database 404 may also store information associatedwith the routing 412 and handling of collaboration conferencing, such asaccepted communication devices, welcoming messages and operational rulesfor conducting the collaboration conference. In general, any informationthat may be utilized by the CCRS to route a collaboration communicationand conduct the collaboration conference may be stored in one or moredatabases associated with the CCRS.

The CCRS also includes a web server 406 or web application that utilizesone or more applications stored in an application server 408 to executethe one or more applications. For example, the web server 406 mayinclude one or more application programming interfaces (APIs) thatexecute any number of stored applications to perform the operationsdescribed herein. The web server 406 may also enable the provisioning ofthe databases 404 of the CCRS by the application server 408. Inaddition, the CCRS may include a network interface unit 410 as a proxyfor receiving any type of information and/or instructions from thenetwork 102 to route the communication. The network interface unit 410may also initiate one or more of the applications stored in theapplication server or database for execution by the CCRS and/or receivea request from the telecommunications network to initiate acollaboration conference.

Through the use of the described components, the CCRS 402 provides addedflexibility and features to collaboration conferencing not previouslyavailable. For example, because each collaboration conference request isrouted through the CCRS or system of CCRS, routing rules may be appliedto a block of related requesters identified by a master ID number orcustomer number, removing the need to update the routing rules for eachmember associated with the master ID or customer number. In addition,the database 404 of the CCRS 402 may maintain a control engine or stateof a particular CCRS that determines which conference bridge acollaboration conference occurs. Thus, through the centralized nature ofthe CCRS 402 and the storage of customer and conference information, theCCRS provides flexibility in routing the collaboration conferencerequests.

In operation, the CCRS 402 may perform the operations of the flowchartof FIG. 3B. In particular, the CCRS 402 receives a request to establisha collaboration conference at the network interface 410 in operation352. The request may include information concerning the requestor, suchas requestor's telephone number and access code number. However,although the operations of FIG. 3B are described in reference to therequest comprising the requestor's telephone phone number and accesscode number, this is but one example of the information used by the CCRSto identify the requester. For example, the request may include anidentification of the requester's communication device, such as a textstring of the requester's personal computer. In another example, therequester's name may be used as the identifier of the requester in therequest. Thus, any operation described herein utilizing the requester'stelephone number and access code may be applied to other informationcontained in the request. For ease of instruction, however, the exampleof the telephone number and access code number is used.

Upon receiving the request, the application server 408, in concert withthe web server 406, utilizes the requestor's telephone number and accesscode number to possibly determine a group ID number for the requester inoperation 354. In particular, with the requester's information, theapplication server 408 accesses a lookup table stored in the database404 to match the telephone number and code access number to the group IDnumber. In some instances, it is advantageous to associate a group IDnumber to a group of users of the collaboration conference system. Forexample, through the group ID, one or more routing rules may be appliedto the entire group without the need to provide a routing rule for eachindividual member of the group. In some instances, the group ID numbermay be associated with a customer ID number such that each memberassociated with a customer ID number is given the same group ID numberand alterations to the customer's account with the network can beapplied to each group member through alterations to routing rulesassociated with the group ID number. Other information concerning therequester, the network and/or the collaboration conference may also beretrieved by the application server 408.

In operation 356, the application server 356 may also associate a masterID reference or number to the collaboration conference request andstores the master ID reference or number in the database 404. The masterID reference or number is utilized by the network to track thecollaboration conference and the participants to the conference and maybe associated with the requester's information. With the master IDnumber associated with the request, the application server 408 againaccesses the database 404 to determine a state of the collaborationconference. In general, if the collaboration conference has beenestablished on a conference bridge (such that the requester is aparticipant to the collaboration conference and not the initiator), thedatabase 404 includes an identification of the conference bridge onwhich the collaboration conferencing is hosted. Alternatively, if therequest is to initiate a new collaboration conference, the databaseincludes a notification the request is a request for a new collaborationconference, at which point the application server routes the request toa master CCRS device that executes a master control engine applicationto determine which conference bridge will host the conference. In thismanner, the components of the CCRS 402 receive the request to join orinitiate a collaboration conference and route the request to the properconference bridge.

As mentioned above, the database 402 may include a subscriberinformation table 414 that associates information of the requester (suchas a telephone number, access code number or other identification orreference of a requestor) to a group ID number for the CCRS system.Thus, several different requester references can be associated with thesame group ID number, such as a customer number. In addition, one ormore routing rules 412 can be associated with a group ID number in thedatabase 402. For example, one routing rule 412 may restrict allcollaboration conferences for a particular group ID number to aparticular conference bridge. This removes the need to manually changethe routing rules for each individual requester for all of the membersof a particular group ID number. Further, the database 404 of the CCRS402 may be utilized by a control engine 418 of the CCRS system to storeinformation 416 utilized by the control engine, such as associating amaster ID number of a collaboration conference with an ID of theconference bridge on which the conference is hosted, the status of acollaboration conference 420, the start time of the collaborationconference, the participant count of the conference, the maximum numberof participants that have attended the particular conference, and thelike. In general, the database 404 may include any informationconcerning collaboration conferences hosted by the telecommunicationsnetwork.

FIG. 5 is a block diagram illustrating an example of a computing deviceor computer system 500 which may be used in implementing embodiments ofthe present invention. The computer system (system) includes one or moreprocessors 502-506. Processors 502-506 may include one or more internallevels of cache (not shown) and a bus controller or bus interface unitto direct interaction with the processor bus 512. Processor bus 512,also known as the host bus or the front side bus, may be used to couplethe processors 502-506 with the system interface 514. Processors 502-506may also be purpose built for processing/mixing media data, such asaudio or video components of a media stream, such as a digital switchprocessor. System interface 514 may be connected to the processor bus512 to interface other components of the system 500 with the processorbus 512. For example, system interface 514 may include a memorycontroller 515 for interfacing a main memory 516 with the processor bus512. The main memory 516 typically includes one or more memory cards anda control circuit (not shown). System interface 514 may also include aninput/output (I/O) interface 520 to interface one or more I/O bridges orI/O devices with the processor bus 512. One or more I/O controllersand/or I/O devices may be connected with the I/O bus 526, such as I/Ocontroller 528 and I/O device 550, as illustrated.

I/O device 550 may also include an input device (not shown), such as analphanumeric input device, including alphanumeric and other keys forcommunicating information and/or command selections to the processors502-506. Another type of user input device includes cursor control, suchas a mouse, a trackball, or cursor direction keys for communicatingdirection information and command selections to the processors 502-506and for controlling cursor movement on the display device.

System 500 may include a dynamic storage device, referred to as mainmemory 516, or a random access memory (RAM) or other computer-readabledevices coupled to the processor bus 512 for storing information andinstructions to be executed by the processors 502-506. Main memory 516also may be used for storing temporary variables or other intermediateinformation during execution of instructions by the processors 502-506.System 500 may include a read only memory (ROM) and/or other staticstorage device coupled to the processor bus 512 for storing staticinformation and instructions for the processors 502-506. The system setforth in FIG. 5 is but one possible example of a computer system thatmay employ or be configured in accordance with aspects of the presentdisclosure.

According to one embodiment, the above techniques may be performed bycomputer system 500 in response to processor 504 executing one or moresequences of one or more instructions contained in main memory 516.These instructions may be read into main memory 516 from anothermachine-readable medium, such as a storage device. Execution of thesequences of instructions contained in main memory 516 may causeprocessors 502-506 to perform the process steps described herein. Inalternative embodiments, circuitry may be used in place of or incombination with the software instructions. Thus, embodiments of thepresent disclosure may include both hardware and software components.

A machine readable medium includes any mechanism for storing informationin a form (e.g., software, processing application) readable by a machine(e.g., a computer). Such media may take the form of, but is not limitedto, non-volatile media and volatile media. Non-volatile media includesoptical or magnetic disks. Volatile media includes dynamic memory, suchas main memory 516. Common forms of machine-readable medium may include,but is not limited to, magnetic storage medium (e.g., floppy diskette);optical storage medium (e.g., CD-ROM); magneto-optical storage medium;read only memory (ROM); random access memory (RAM); erasableprogrammable memory (e.g., EPROM and EEPROM); flash memory; or othertypes of medium suitable for storing electronic instructions.

As described, by utilizing one or more of the embodiments describedabove, the CCRS system may route a collaboration conferencecommunication to an appropriate conference bridge based on any number ofpreferences or information about the requester and/or communicationnetwork. As also mentioned above, a telecommunications network mayemploy a plurality of CCRS in a telecommunications network thatcommunicate and work in concert to route the collaboration conferencecommunications. For example, FIG. 6 is a block diagram of a plurality ofcentral conferencing routing servers connected to a plurality ofconference bridges over a telecommunications network. The plurality ofCCRS devices may take many forms. For example, the CCRS may be aplurality of application servers embodied on any number oftelecommunication devices. In another example, the various componentsthat comprise the plurality of CCRS in the network may be embodied onvarious such components. In general, the CCRS system 600 of atelecommunications network may include any number of CCRS 602-606 thatoperate in concert within a telecommunications network to provide thefeatures and functionalities described herein.

The embodiment of the network 600 of FIG. 6 includes three CCRS 602-606.However, any number of CCRS may be present in the network to perform theoperations described herein. Also, as mentioned above, the CCRS may bein different telecommunication devices, in the same telecommunicationdevices, or may be spread at a component level among severaltelecommunication devices. As used here, however, the CCRS 602-606 arediscussed as being separate CCRS devices, although any of the abovedescribed embodiments of the CCRS system are contemplated to provide thevarious features of the CCRS system described herein.

In one embodiment, the CCRS may be located in different geographiclocations, such that CCRS A 602 may be located in Denver, Colo., CCRS B604 may be located in Minneapolis, Minn. and CCRS C 606 may be locatedin London, England, for example. In general, the CCRS 602-606 of thesystem 600 may be located in any geographic location thetelecommunications network through which the CCRS operates is located.Further, each CCRS 602-606 of the system 600 may communicate with theother CCRS devices within the system, as shown in FIG. 6 through CCRScommunication lines 618. Through these CCRS communication lines 618, theCCRS 602-606 can exchange information concerning the routing andhandling of the collaboration conferences. The CCRS communication lines618 may be included as a portion of or may be separate from thetelecommunications network.

In addition, each CCRS 602-606 may be connected to any number ofconference bridges 608-616. The conference bridges 608-616 are similarto the conference bridges described above with relation to FIGS. 1 and2. In general, the conference bridges 608-616 host collaborationconferences. Although five such conference bridges are shown in FIG. 6,it is contemplated that any number of conference bridges 608-616 may beconnected to the plurality of CCRS 602-606. Also, although the system600 of FIG. 6 is configured such that each CCRS 602-606 is connected toeach conference bridge 608-616 through CCRS-bridge communication lines620, the system may be configured differently such that each CCRS isconnected to any number of available conference bridges, including beingconnected to none of the available conference bridges. As should beappreciated, the CCRS-bridge communication lines 620 may occur over atelecommunications network as described in relation to FIG. 1 above.

As explained above with reference to FIGS. 3 and 3B, during operationthe CCRS system receives a request to join or initiate a collaborationconference from a requestor. If a collaboration conference is inprogress, the receiving CCRS can access its database to determine thatthe collaboration conference is in progress and route the request tojoin to the proper conference bridge that is hosting the collaborationconference. However, if the request is to establish a new collaborationconference, the CCRS system 600 can determine which conference bridge608-616 to host to the conference. To avoid having the multiple CCRSdevices determining where a particular collaboration conference ishosted, the CCRS system 600 may designate one CCRS as the master CCRS.In particular, the CCRS system 600 can designate a CCRS to execute amaster control system program that is tasked by the system to determinea conference bridge 608-616 for all requests for new collaborationconferences. In one embodiment, any one of the CCRS 602-606 of thesystem 600 can be designated as the master control system or masterCCRS. Thus, while each CCRS has the capability to operate as the mastercontrol engine for the system 600, only one CCRS executes the mastercontrol engine program at any one time. Through the master controlengine program, any one of the CCRS devices 602-606 can route a requestto join an existing collaboration conference once the conference isestablished, but only the master control engine (or master CCRS)determines the hosting conference bridge for a request for a newcollaboration conference.

To begin the process of determining which CCRS 602-606 of the system 600is designated as the master control engine, each CCRS 602-606 mayperform the operations of the flowchart of FIG. 7 to gather informationabout the system configuration. This gathered information may then beutilized by the system 600 to determine which CCRS 602-606 is the masterCCRS tasked to determine the hosting conference bridge 608-616 for aparticular request for a new collaboration conference.

Beginning in operation 702, each CCRS 602-606 determines the identifieror ID number associated with the CCRS. In general, thetelecommunications network in which the CCRS system 600 is incorporatedmay assign an ID number or other identifier to each CCRS 602-606 in thesystem. In one example, the ID number is associated with the CCRS duringprovisioning of the CCRS device by a network administrator ortechnician, such as upon installation of the CCRS into the network.Further, the ID number may be associated with CCRS 602-606 in such amanner as to provide a preference to a particular CCRS or control engineof the CCRS that is designated as the master CCRS or master controlengine. The manner through which the ID number is used to determinewhich CCRS 602-606 is tasked as the master control engine is discussedin more detail below with reference to FIG. 8.

Continuing to operation 704, each CCRS 602-606 of the system 600determines the number of conference bridges 608-616 to which theparticular CCRS is connected. For example, as shown in FIG. 6, CCRS A602 is connected to and can communicate with each of conference bridge A608 through conference bridge E 616. Such connections between a CCRSdevice and a conference bridge are referred to herein as the locallyconnected or local conference bridges to each CCRS. Thus, CCRS A 602determines in operation 704 that it is locally connected to fiveconference bridges over communication lines 620. The same operation isperformed by CCRS B 604 and CCRS C 606, each determining that they arealso connected to five conference bridges. The number of determinedlocal connections provides the system with a manner to determine whichCCRS device communicates with the most number of conference bridges,making the master control engine designation the most effective.

Continuing to operations 706 and 708, each CCRS 602-606 also determinesthe total number of conference bridges 608-616 locally connected to allof the CCRS in the system 600. In particular, each CCRS 602-606 receivesthe number of locally connected conference bridges determined inoperation 704. To receive this information, each CCRS 602-606 in thesystem 600 broadcasts their locally connected conference bridges to theother CCRS devices in the system 600. Thus, continuing the exampleabove, CCRS A 602 broadcasts over communication lines 618 to CCRS B 604and CCRS C 606 that CCRS A is connected to five conference bridges.Similarly, CCRS B 604 broadcasts to CCRS A 602 and CCRS C 606 that CCRSB is also connected to five conference bridges and CCRS C broadcasts toCCRS A and CCRS B that CCRS C is connected to five conference bridges.In operation 706, each CCRS receives these broadcasts and stores theinformation in the related database for use in operation 708.

With the information received in operation 706, each CCRS 602-606calculates the total number of conference bridges 608-616 connected toall of the CCRS in the system 600 in operation 708. Thus, because eachof the CCRS 602-606 in the example of FIG. 6 is connected to fiveconference bridges, each CCRS calculates the total number of locallyconnected bridges to be fifteen (15), as CCRS A 602 is connected to fiveconference bridges 608-616, CCRS B is also connected to five conferencebridges and CCRS C is also connected to five conference bridges. Thisinformation is also stored in the database for use by the CCRS system600.

With the information obtained through the operations of FIG. 7, the CCRSsystem 600 can determine which CCRS is tasked as the master controlengine through the method of the flowchart of FIG. 8. In particular, thetelecommunications network or one or more components associated with ora part of the CCRS system 600 of FIG. 6 performs the operations of FIG.8 to determine which CCRS is the master control engine for determiningwhich conference bridge 608-616 of the system hosts a collaborationconference.

Beginning in operation 802, the CCRS system determines if the calculatedsum of local bridges across all of the CCRS of the system is equal ascalculated by each CCRS. This number is determined in operation 708 ofthe flowchart of FIG. 7 discussed above. Thus, in the example givenabove, each of the CCRS in the system calculated a total number of 15locally connected bridges for all of the CCRS in the system. Thus, inoperation 802, the system would determine that the calculated sum oflocal bridges across all of the CCRS of the system is calculated equallyby each of the CCRS. However, in some circumstances, at least one CCRSmay calculate a different total number of locally connected bridges foreach CCRS. For example, a CCRS system 900 is shown in FIG. 9A that issimilar to the system of FIG. 6. However, in the example system 900shown in FIG. 9A, CCRS communication line 922 is faulty ormalfunctioning such that CCRS C 906 cannot communicate with CCRS B 904.Thus, in this example, CCRS B 904 would not have received the broadcastfrom CCRS C 906 of the number of locally connected conference bridgesconnected to CCRS C. Thus, CCRS B 904 calculates the total number ofconnected bridges as ten (five bridges connected to CCRS A and fivebridges connected to CCRS B). However, CCRS A 902 would continue tocalculate the total number of connected bridges as 15 as it receives thebroadcast from each other CCRS device. Thus, in this example, not all ofthe CCRS would calculate the same total of connected bridges across allof the CCRS.

If the system determines that not all of the CCRS calculated the sametotal number of connected bridges, the system would then determine, inoperation 804, if only one of the control engines of the CCRS has thehighest calculated total of connected bridges. For example, due tocommunication problems between the CCRS devices in the system, more thanone CCRS or control engine may calculate the largest total number ofconference bridges connected to all of the CCRS devices in the system.This is the case illustrated in FIG. 9A where CCRS A 902 calculates 15total bridge connections (five each from CCRS A, CCRS B 904 and CCRS C906), while CCRS B calculates ten total bridge connections (five fromCCRS A and five from CCRS B) and CCRS C similarly calculates ten totalbridge connections (five from CCRS A and five from CCRS C). If only oneCCRS calculates the highest number of total connected conferencebridges, the system would select the CCRS that calculates the largestsum of connected bridges as seen by all CCRS devices as the mastercontrol engine to select which conference bridge hosts requests for acollaboration conference in operation 806.

Returning to operation 804, if the system determines that more than onecontrol engine has calculated the highest sum of connected bridges, thesystem performs operation 808 and removes from consideration for mastercontrol engine status all control engines of CCRS except those thatcalculated the highest total number. For example, in a system includingtwenty conference bridges and three CCRS devices, several CCRS devicesmay calculate a total of sixty conference bridge connections, whileothers may calculate fewer than sixty if there is a faulty connection inthe system. In this example, each of the CCRS devices that calculate thetotal number of connections of less than sixty is removed fromconsideration for master control engine status in operation 808.However, each CCRS that calculates the highest number would remain inconsideration for master control engine status. Upon removal of thoseCCRS devices or control engines in operation 808, the system proceeds onto operation 810. Similarly, if the system determines in operation 802that the calculated sum of connected bridges for all CCRS devices isequal, the system performs operation 808.

Operations 810-816 are similar to operations 802-808 described above.However, in these operations, the CCRS system analyzes the number oflocally connected conference bridges to each CCRS device individually.Thus, in operation 810, the CCRS system determines if the number oflocally connected conference bridge to each CCRS device is the sameacross all of the CCRS devices. In particular, referring once again tothe example of FIG. 6, CCRS A 602 is connected to five conferencebridges 608-616, CCRS B 604 is also connected to five conference bridgesand CCRS C is connected to five conference bridges. Thus, in thisexample, each CCRS device 602-606 is connected to the same number ofconference bridges through CCRS-bridge communication lines 620. As shownin the flowchart of FIG. 8, in such a case, the CCRS system wouldproceed to operation 818, described in more detail below.

Another example is illustrated in FIG. 9B, however. FIG. 9B is a CCRSsystem 950 that is similar to the system of FIG. 6. However, in theexample system shown in FIG. 9B, communication line 924 between CCRS C906 and conference bridge E 916 is faulty or malfunctioning such thatCCRS C cannot communicate with conference bridge E. Thus, in thisexample, CCRS C 906 communicates only with conference bridges A-D608-614. As a result, the number of locally connected conference bridgesfor CCRS C 906 is four, while both CCRS A 602 and CCRS B 604 are locallyconnected to five conference bridges. Thus, returning to operation 810of FIG. 8, the CCRS system would determine that not all CCRS devices inthe CCRS system have the same number of locally connected conferencebridges in this example. In such cases, the CCRS system may then proceedto operation 812.

Similar to operation 804 described above, if the system determines thatnot all of the CCRS have the same number of locally connected bridges,the system would then determine in operation 812 if only one of thecontrol engines of the CCRS has the highest number of locally connectedbridges. For example, due to communication problems between the CCRSdevices and the conference bridges, more than one CCRS or control enginemay calculate a larger number of locally connected conference bridgesconnected to the CCRS devices in the system. This is the caseillustrated in FIG. 9B where CCRS A 902 and CCRS B 904 are connected tofive conference bridges (conference bridges A-E 608-616), while CCRS Cis connected to four conference bridges (conference bridges A-D608-614). However, if only one CCRS device has the highest number oflocally connected conference bridges connected to it, the CCRS systemsets the control engine associated with that CCRS as the master controlengine in operation 814. The master control engine is then tasked withdetermining which conference bridge hosts collaboration conferencerequests.

Returning to operation 812, if the system determines that more than onecontrol engine has the highest number of locally connected bridges, thesystem performs operation 816 and removes from consideration for mastercontrol engine status all control engines of CCRS except those thatcalculated the highest number of locally connected bridges. Thus, in theexample of FIG. 9B, CCRS C 906 would be removed from consideration asthe number of locally connected conference bridges is four and thenumber of locally connected bridges for CCRS A 902 and CCRS B 904 isfive. Upon removal of those CCRS devices or control engines in operation816, the system proceeds on to operation 818.

In operation 818, the CCRS system sets the master control engine as theremaining CCRS with the lowest ID number. As mentioned above, each CCRSin a CCRS system is assigned an ID number. Thus, in operation 818, theID number is utilized by the system to select a control engine as themaster control engine from the remaining CCRS. In another embodiment,the master control engine may be set as the control engine or CCRS withthe highest ID number. In this manner, a selection hierarchy of the CCRSdevices may be established through the ID numbers if each CCRS deviceincludes the same number of connections to the conference bridges. Thehierarchy of CCRS devices may be set through the ID numbers for anyreasons related to the network. For example, the hierarchy may provide apreference to a master control engine that is geographically closer tothe headquarters of the administrator of the telecommunications network.In another example, the hierarchy may provide a preference to a mastercontrol engine that is logically central to the telecommunicationsnetwork to reduce transmission times through the network from the masterCCRS. In general, the hierarchy may be established through the CCRS IDnumbers for any reason related to the operation of the network.

In general and illustrated through the flowchart of FIG. 8, the mastercontrol engine is selected based on three criteria in a particularorder: 1) the calculated sum of all connected bridges seen by all of theCCRS devices; 2) the number of locally connected conference bridges foreach individual CCRS devices; and 3) the ID number associated with eachCCRS device. The CCRS system uses the above criteria to determine theintegrity of the connections within the system and, if all connectionswithin the system are functioning properly, the master control engine isdetermined through the ID number. As should be appreciated, each CCRSincludes a database that stores any information needed for the abovedeterminations, as well as one or more applications to perform theselection of the master control engine or to perform the operations ofthe master control engine. In addition, one or more safeguards may beimplemented in the CCRS system that prevents the master control enginefrom bouncing between two or more CCRS devices. For example, a delay maybe incorporated that delays the switching of the master control enginefrom one CCRS to another to prevent frequent skipping of the mastercontrol engine status and allow the master control engine selectionprocess be stable.

Once it is determined which of the CCRS devices is tasked as the mastercontrol engine, the CCRS system may begin routing requests forcollaboration conferences to a connected conference bridge. Inparticular, CCRS system and/or the various components of a CCRS systemmay perform one or more of the operations illustrated in the flowchartof FIG. 10 to connect all requests to join an existing collaborationconference or initiate a new collaboration conference on a conferencebridge.

The method of FIG. 10 begins in operation 1002 when a CCRS device of theCCRS system receives a request to join or initiate a collaborationconference from a requestor. In general, any CCRS device of the systemmay receive the request to join or initiate a collaboration conferencefrom a requestor to the telecommunications network. Upon receipt, theCCRS may execute an application that checks the database of the CCRS todetermine whether the requested conference is active in operation 1004.In addition to indicating that the collaboration conference is active,the database for the receiving CCRS may also indicate the particularconference bridge hosting the collaboration conference. In the case whena collaboration conference is active and the conference bridge is known,the receiving CCRS routes the request to join the collaborationconference to the appropriate conference bridge such that the requestorthen joins the conference.

However, in some circumstances, such as when initiating a collaborationconference, the receiving CCRS checks the database and determines thatthe requested collaboration conference is not active. In this case, theCCRS then accesses the database to determine the identity of the CCRSdevice running the master control engine or otherwise acting as themaster controller (which, in one embodiment, could be the same CCRS asthe receiving CCRS) and, in operation 1006, routes the request to themaster control engine for further processing.

In general, operations 1002 through 1006 are performed by the receivingCCRS, while operations 1008 through 1016 of FIG. 10 are performed by theCCRS running the master control engine. However, in some embodiments,the receiving CCRS and the master control engine CCRS are the samedevice such that one CCRS performs all of the operations of FIG. 10.

In operation 1008, the master control engine determines which bridgewill host the requested collaboration conference. In general, the mastercontrol engine may use any information available or method to determinewhich bridge hosts a requested collaboration conference. For example,the master control engine may consult a priority table or list todetermine which conference bridge will host the collaborationconference. The information or data within the priority table may bestored in the databases of the respective CCRS devices. In general, thepriority list is associated to each account of the network, a customernumber or other identifier of a requester, and the priority listidentifies one or more conference bridges that may host a collaborationconference and a priority associated with each conference bridge. Forexample, the priority list for one customer may include three conferencebridges ranked in order by the highest priority to the lower priority.In some embodiments, a plurality of conference bridges may be groupedinto a single priority group. Upon receipt of a request for acollaboration conference, the master control engine may identify therequester, access the priority list associated with the requester andselect a conference bridge based on the priority list. As discussed inmore detail below, the priority of the conference bridges for anyrequester may be based on several criteria, including geographiclocation and technical features of the conference bridges. The operationof the load balancing and priority routing in relation to the CCRS isdescribed in more detail in concurrently filed nonprovisionalapplication Ser. No. 13/708,678 titled “LOAD BALANCING IN A CENTRALCONFERENCING ROUTING SERVER,” which is hereby incorporated by referenceherein.

In one example of such criteria, one or more conference bridges may beassigned a higher priority based on the geographical location of theconference bridge. For various reasons, a conference bridge located in aparticular area may be preferable for hosting a collaboration conferencefrom a particular requester. For example, a conference bridge locatednearer the requester may be preferable to one located a far distance. Inthis situation, the priority list for that requester may be updated orcreated to provide priority to the conference bridge near the requestersuch that, upon determining which conference bridge to host thecollaboration conference, the control state engine may first considerthe higher prioritized bridge.

Similarly, a higher priority may be given to a conference bridge thatprovides additionally requested features for the collaborationconference. For example, the requester may request the conference occurin wideband audio or other features that require an IP-based conferencebridge. In this situation, an IP-based conference bridge may be given ahigher priority than non-IP-based conference bridges in an attempt tomeet the requests of the requester. Other priority criteria may be thesize or other network requirements of the conference. For example, arequester may routinely request a high volume conference such that theCCRS may associate a conference bridge that handles larger conferences(conferences with more participants) a higher priority for thatparticular requester. In general, however, any information or criteriamay be considered when the master control engine prepares the prioritylist associated with a requester.

Once the conference bridge is selected by the master control engine inoperation 1008, the master control engine instructs an applicationserver of the master CCRS to transmit a request to the selectedconference bridge in operation 1010. In one embodiment described above,the application server routes the conference request to a conferencebridge by requesting the conference bridge for an available port on thebridge. If the conference request is a request to establish acollaboration conference, the request may be for a plurality ofavailable ports to host the conference. The allocation of availableports associated with the conference bridge may be handled by a requestfrom the CCRS or by a control server associated with the conferencebridge. In either case, available ports of the conference bridge may bemade available in response to the conference request. In otherembodiments, selection of a conference bridge may be accomplished usingdomain name system (DNS) resolution techniques, such as round-robinselection or intelligent algorithms that account for location and/orproximity considerations (e.g., Anycast), load on the bridges,popularity or any other known policy. Such techniques may either replaceor supplement the routing protocols as part of the conference bridgeselection process.

Also in operation 1010, the master control engine sets the status of thecollaboration conference to a temporary or “temp” status. This state isstored in the database of the CCRS device that is tasked as the mastercontrol engine. In general, a collaboration conference can be designatedas having several states, including “active”, “temp”, “ended” and“unknown”. As discussed above, an “active” state indicates that thecollaboration conference is established on a conference bridge. A “temp”state indicates that a request for a collaboration conference has beenreceived by the master control engine and the master control engine isattempting to establish the collaboration conference on a conferencebridge. An “ended” state indicates that a collaboration conference hasended, but provides a small window of time to allow the conferencingsystem to completing the conference session. An “unknown” status is setwhen a collaboration conference is interrupted by a failure at theconference bridge. Although only four states are discussed herein, itshould be appreciated that any number of states may be applied to acollaboration conference to aid the CCRS system in maintaining andtracking the various collaboration conferences performed through thenetwork.

As mentioned, the master control engine sets the state of the requestedcollaboration conference to a “temp” state in operation 1010. While thecollaboration conference is in the temp state, any additional requeststo join and the original request to initiate the particularcollaboration conference are held until an acknowledgement from theselected conference bridge is received. Thus, in operation 1012, themaster CCRS receives an acknowledgement message from the selectedconference bridge that the requested ports are available indicating thatthe requested ports for hosting a collaboration conference are availableon the selected conference bridge.

In response, the application server of the master CCRS routes therequest for the collaboration conference to the selected bridge inoperation 1014. In addition, the application server can route anyadditional requests that may have arrived at the master control engineCCRS device while the collaboration conference was in a “temp” state.Also, in operation 1016, the master control engine sets the state of thecollaboration conference to “active”. This active status may also beprovided to the other CCRS devices in the CCRS system so that those CCRSdevices become aware of the active conference. In one embodiment, theCCRS devices receive the active status of any collaboration conferencethrough the connection to the conference bridge hosting the conference.In another embodiment, the active status and the hosting conferencebridge of the collaboration conference may be broadcast to the otherCCRS devices in the CCRS system for storage in each CCRS database. Thus,when additional requests are made to join the collaboration conference,the receiving CCRS does not need to refer the request to the mastercontrol engine for routing. Rather, the receiving CCRS can check thedatabase and determine that the requested collaboration conference isactive and on which conference bridge the conference is hosted. Thisalso relieves the master control engine to route other collaborationconferencing initialization requests.

Another advantage that the CCRS system provides includes the situationwhen a conference bridge is placed offline or suffers a failure. Forexample, a scheduled maintenance on one of the conference bridges may bedesired by a network administrator. Thus, conferences currently beinghosted on the conference bridge for repair may be maintained by theconference bridge until completion, but new conferences may be directedto other conference bridges in an effort to remove the conferences fromthe selected conference bridge. To accomplish this, the CCRS may removethe failing or scheduled-for-repair conference bridge from the prioritylists for each requester. Thus, when a request is received to begin anew collaboration conference and the CCRS consults the priority list forthe requester, the failing or scheduled-for-repair bridge is not anavailable option. However, the CCRS devices may continue to directrequests for ongoing conferences to the proper conference bridge as thestate of the collaboration conference remains active until terminationof the conference. The operation of disaster recovery in relation to theCCRS is described in more detail in concurrently filed nonprovisionalapplication Ser. No. 13/708,689 titled “DISASTER RECOVERY WITH A CENTRALCONFERENCING ROUTING SERVER,” which are hereby incorporated by referenceherein.

The CCRS may perform a similar operation when a conference bridge entersa failure state. In this situation, the failed bridge may be removedfrom the priority list for each requester. In addition, all requestsreceived by the CCRS to join an existing conference may be sent toanother conference bridge. However, this may create a situation where aconference is split between two conference bridges. In this situation,the CCRS may generate a notice to a network administrator of thepotential for a split conference so that the administrator may directeach participant of the split conference to a single, operatingconference bridge. In some embodiments, the recovery of a splitconference into a united conference may be performed automatically bythe CCRS upon detection. In addition, upon bringing the failed bridgeback online, the CCRS may throttle the conferences placed on the bridgeto prevent an overload of the bridge.

The CCRS includes other features that may aid the network intransmitting collaboration conferences. For example, one embodiment ofthe CCRS may route an internet or web connection that is associated withthe collaboration conference to the same conference bridge that hoststhe conference to maintain continuity between the related webapplication and the conference. Another example may include a conferencelingering feature that maintains the status of each conference in thestate engines for a specified amount of time to allow any changes oralterations to the requesters account to propagate to each conferencebridge and state engine associated with the CCRS. Additionally, the CCRSmay be configured to collect information about the conferences and storethis information for analyze or use by the network and/or administratorsof the network. For example, information on the number of participantsassociated with any conference may be maintained for future analysis todifferentiate large conference users for future routing decisions.

Embodiments of the present disclosure include various steps, which aredescribed in this specification. The steps may be performed by hardwarecomponents or may be embodied in machine-executable instructions, whichmay be used to cause a general-purpose or special-purpose processorprogrammed with the instructions to perform the steps. Alternatively,the steps may be performed by a combination of hardware, software and/orfirmware.

The foregoing merely illustrates the principles of the invention.Various modifications and alterations to the described embodiments willbe apparent to those skilled in the art in view of the teachings herein.It will thus be appreciated that those skilled in the art will be ableto devise numerous systems, arrangements and methods which, although notexplicitly shown or described herein, embody the principles of theinvention and are thus within the spirit and scope of the presentinvention. From the above description and drawings, it will beunderstood by those of ordinary skill in the art that the particularembodiments shown and described are for purposes of illustrations onlyand are not intended to limit the scope of the present invention.References to details of particular embodiments are not intended tolimit the scope of the invention.

What is claimed is:
 1. A method for routing one or more collaborationconference access requests, the method comprising: receiving acollaboration conference access request from a requester's communicationdevice at a master conferencing routing server designated from aplurality of conferencing routing servers, each conferencing routingserver of the plurality of conferencing routing servers havingcapability of being designated as the master conferencing routing serverand executing a master control engine application, wherein thedesignated master conferencing routing server executes the mastercontrol engine application; requesting operational information of theplurality of conference bridges, the operational information comprisingat least an available capacity for the plurality of conference bridges,wherein the operational information of the plurality of conferencebridges further comprises at least one technical feature and the mastercontrol engine application is further configured to analyze the at leastone technical feature of the plurality of conference bridges;associating an identification number with the collaboration conferenceaccess request, the identification number associated with a customer ofa telecommunications network; selecting a hosting conference bridge froma plurality of conference bridges connected to the plurality ofconferencing routing servers, the hosting conference bridge configuredto host a collaboration conference, the selection by the designatedmaster conferencing routing server of the plurality of conferencingrouting servers and occurring in response to the collaborationconference access request and the identification number; transmittingone or more routing messages to the telecommunications network, whereinthe one or more routing messages include an indication of the selectedconference bridge; transmitting a request for a plurality of opencommunication ports to the selected conference bridge; receiving anacknowledgement message from the selected conference bridge indicatingthat the plurality of requested communication ports are available; andbroadcasting one or more conference state messages to the plurality ofconferencing routing servers indicating an active state of an initiatedcollaboration conference and the indication of the selected conferencebridge.
 2. The method of claim 1 further comprising: storing a temporarystate associated with the collaboration conference access request in adatabase connected to the master conferencing routing server.
 3. Themethod of claim 2 further comprising: storing an active state associatedwith the collaboration conference access request in the databaseconnected to the master conferencing routing server.
 4. The method ofclaim 3 wherein at least one conference bridge of the plurality ofconference bridges is a session initiation protocol (SIP) basedtelecommunication device.
 5. The method of claim 4 wherein theacknowledgement message from the selected hosting conference bridgecomprises at least an IP address of the selected conference bridge. 6.The method of claim 1 wherein the selecting operation comprises:accessing a priority list of the plurality of conference bridges, thepriority list configured to list the plurality of conference bridges inan order of preference based on the identification number.
 7. The methodof claim 1 wherein the master conferencing routing server is designatedbased on a determined number of conference bridges of the plurality ofconference bridges to which each conferencing routing server of theplurality of conferencing routing servers is locally connected.